diff options
Diffstat (limited to 'REORG.TODO/sysdeps/aarch64/rawmemchr.S')
| -rw-r--r-- | REORG.TODO/sysdeps/aarch64/rawmemchr.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/aarch64/rawmemchr.S b/REORG.TODO/sysdeps/aarch64/rawmemchr.S new file mode 100644 index 0000000000..a6e1753ddf --- /dev/null +++ b/REORG.TODO/sysdeps/aarch64/rawmemchr.S @@ -0,0 +1,42 @@ +/* rawmemchr - find a character in a memory zone + + Copyright (C) 2015-2017 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr. + Call strlen without setting up a full frame - it preserves x14/x15. +*/ + +ENTRY (__rawmemchr) + cbz w1, L(do_strlen) + mov x2, -1 + b __memchr + +L(do_strlen): + mov x15, x30 + cfi_return_column (x15) + mov x14, x0 + bl __strlen + add x0, x14, x0 + ret x15 + +END (__rawmemchr) +weak_alias (__rawmemchr, rawmemchr) +libc_hidden_builtin_def (__rawmemchr) |